<?php // content="text/plain; charset=utf-8" require_once ('jpgraph/jpgraph.php'); require_once ('jpgraph/jpgraph_line.php'); // Callback to negate the argument function _cb_negate($aVal) { return round(-$aVal); } // A fake depth curve $ydata = array(0,1,4,5,8,9,10,14,16,16,16,18,20,20,20,22,22.5,22,19,19,15,15,15,15,10,10,10,6,5,5,5,4,4,2,1,0); // Negate all data $n = count($ydata); for($i=0; $i<$n; ++$i) { $ydata[$i] = round(-$ydata[$i]); } // Basic graph setup $graph = new Graph(400,300); $graph->clearTheme(); $graph->SetScale("linlin"); $graph->img->SetMargin(50,50,60,40); $graph->SetMarginColor('darkblue'); $graph->SetColor('darkblue'); $graph->SetAxisStyle(AXSTYLE_BOXOUT); $graph->title->Set("Depth curve. Dive #2"); $graph->title->SetFont(FF_FONT1,FS_BOLD); $graph->title->SetColor("white"); $graph->subtitle->Set("(Negated Y-axis)"); $graph->subtitle->SetFont(FF_FONT1,FS_NORMAL); $graph->subtitle->SetColor("white"); // Setup axis $graph->yaxis->SetLabelFormatCallback("_cb_negate"); $graph->xaxis->SetColor("lightblue","white"); $graph->yaxis->SetColor("lightblue","white"); $graph->ygrid->SetColor("blue"); $lp1 = new LinePlot($ydata); $lp1->SetColor("yellow"); $lp1->SetWeight(2); $graph->Add($lp1); $graph->Stroke(); ?>